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A dynamic discrete dislocation plasticity method for the simulation of plastic relaxation under shock loading by Beñat Gurrutxaga-Lerma, Daniel S. Balint,

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Presentation on theme: "A dynamic discrete dislocation plasticity method for the simulation of plastic relaxation under shock loading by Beñat Gurrutxaga-Lerma, Daniel S. Balint,"— Presentation transcript:

1 A dynamic discrete dislocation plasticity method for the simulation of plastic relaxation under shock loading by Beñat Gurrutxaga-Lerma, Daniel S. Balint, Daniele Dini, Daniel E. Eakins, and Adrian P. Sutton Proceedings A Volume 469(2156):20130141 August 8, 2013 ©2013 by The Royal Society

2 The simulated system: a two-dimensional rectangular block shocked with a high-pressure load on one end, with the other modelled as a reflective boundary. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

3 Dislocation configuration at (a) 0.9 ns and (b) 2 ns, showing the appearance of spurious dislocations ahead of the front as a result of the activation of sources by stresses transmitted instantaneously from dislocations behind the front. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

4 The coordinate system used here, as introduced by Markenscoff & Clifton [33]. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

5 Contour of integration, adapted from Markenscoff [37]. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

6 The boundary-value problem, using a superposition scheme. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

7 Stress field components from the injection of a static edge dislocation. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

8 σxz of an injected static edge dislocation at different instants in time. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

9 Numerical solution for the σxz stress field component for the injection of a uniformly moving edge dislocation. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

10 Stress field components from the injection of a non-uniformly moving edge dislocation with speed per time step varying between Mt=0 and Mt=0.62. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

11 The variation of the Peach–Koehler force on a parallel unlike signed dislocation in the same slip plane as (a) a static edge dislocation injected at the origin over three instants in time; (b) a dislocation injected at the origin that moves uniformly with v... Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society

12 The σxx component field for the annihilation of a mobile dislocation by a static dislocation. Beñat Gurrutxaga-Lerma et al. Proc. R. Soc. A 2013;469:20130141 ©2013 by The Royal Society


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